area appears to one side of it. The hairs of the larva are first to be seen, and later the larva itself is plainly distinguishable. Infertile eggs turn a slightly darker shade of green, and in a week or so collapse. Note.—Laid in large flat bunches in irregular rows. Batches of 92 and 140 eggs obtained. Strongly attached to box and slightly to each other. Laid, 15th September; hatched, 30th September = fifteen days. The larva emerges through the top of the. egg, and makes its first meal off the shell. (Described, 15th September, 1912.) Orthosia immunis Walk. Taeniocampa immunis Walk., Noct., 430. Cerastis innocua, ib., 1710. Agrotis acetina Feld., Reise Nov., pl. cix, fig. 6. Orthosia immunis Meyr., Trans. N.Z. Iast., 19, p. 30; Fereday, List N.Z. Lep., Trans. N.Z. Inst., 30, p. 335; Hudson, N.Z. Moths and Butterflies, p. 7, pl. 5, fig. 29. Fairly common. To be taken in great numbers at “sugar” and on street-lamps. Ovum. Class.—Upright. Shape.—Transverse section circular (as a rule). Vertical section: Base flat; sides bulging outwards and curving in towards the top; top flattened Diameter of top, 0·23 mm. Dimensions.—Diameter, 0·65—0·70 mm.; height, 0·47—0·55 mm. Sculpture.—Strong. High reticulations or ribs radiate from the micropylar cap to the equator, converging below. About one in two of the ribs coalesce with another a little above the shoulder of the egg, and there is irregularity in this respect; in more than one instance three ribs coalesce. Thirteen to seventeen ribs meet the micropylar cap. There are from thirty-one to thirty-seven ribs in all. Between the ribs equidistant finer reticulations form quadrilateral cells about twice to three times as broad as long, measurements being—width, 0·05—0·06 mm.; length, about 0·02 mm. Height of longitudinal ribs, 0·01—0·03 mm.; distance apart at equator, 0·05—0·06 mm. Base heavily wrinkled, but not sculptured. Micropyle.—A deep moat surrounds a correspondingly high eruption which bears the micropyle, crater-like. The micropyle is a deep circular cell 0·01 mm. diameter. The eruption is ribbed longitudinally with fine reticulations forming a rosette of thirteen elongated cells surrounding the micropyle; from these the main ribs or reticulations of the egg originate. The floor of the moat is composed of a band of eighteen hexagonal cells, 0·045 mm. long by 0·02 mm. wide, lengthened in a direction radial from the micropyle. Depth of moat or height of eruption, 0·04 mm.; diameter of eruption, 0·07 mm.; width of moat, about 0·05 mm. Shell.—Very strong; transparent; shiny; roughened, and slightly wrinkled between reticulations. Colour.—When fresh laid, white. The second day there is a slight cream tint, changing later to light yellow. On the fourth day the upper half of the egg is lightly mottled with very light brown. On the fifth day there is a distinct broad light-brown band surrounding the egg just above the equator, and a large irregular brown patch covers the micropylar area. The brown coloration now greatly intensifies in shade, the micropylar area being slightly lighter in colour than the equatorial belt. The day before hatching all the light colouring on the shell between the brown-areas turnss